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ATmega16U4 Datasheet(PDF) 163 Page - ATMEL Corporation |
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ATmega16U4 Datasheet(HTML) 163 Page - ATMEL Corporation |
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163 / 408 page  163 7766D–AVR–01/09 ATmega16U4/ATmega32U4 15.12 Register Description 15.12.1 TCCR4A – Timer/Counter4 Control Register A • Bits 7,6 - COM4A1, COM4A0: Comparator A Output Mode, Bits 1 and 0 These bits control the behavior of the Waveform Output (OCW4A) and the connection of the Output Compare pin (OC4A). If one or both of the COM4A1:0 bits are set, the OC4A output overrides the normal port functionality of the I/O pin it is connected to. The complementary OC4B output is connected only in PWM modes when the COM4A1:0 bits are set to “01”. Note that the Data Direction Register (DDR) bit corresponding to the OC4A and OC4A pins must be set in order to enable the output driver. The function of the COM4A1:0 bits depends on the PWM4A, WGM40 and WGM41 bit settings. Table 15-6 shows the COM4A1:0 bit functionality when the PWM4A bit is set to Normal Mode (non-PWM). Table 15-7 shows the COM4A1:0 bit functionality when the PWM4A, WGM40 and WGM41 bits are set to fast PWM mode. Bit 76543210 COM4A1 COM4A0 COM4B1 COM4B0 FOC4A FOC4B PWM4A PWM4B TCCR4A Read/Write R/W R/W R/W R/W W W R/W R/W Initial value 00000000 Table 15-6. Compare Output Mode, Normal Mode (non-PWM) COM4A1..0 OCW4A Behavior OC4A Pin OC4A Pin 00 Normal port operation. Disconnected Disconnected 01 Toggle on Compare Match. Connected Disconnected 10 Clear on Compare Match. Connected Disconnected 11 Set on Compare Match. Connected Disconnected Table 15-7. Compare Output Mode, Fast PWM Mode COM4A1..0 OCW4A Behavior OC4A OC4A 00 Normal port operation. Disconnected Disconnected 01 Cleared on Compare Match. Set when TCNT4 = 0x000. Connected Connected 10 Cleared on Compare Match. Set when TCNT4 = 0x000. Connected Disconnected 11 Set on Compare Match. Cleared when TCNT4 = 0x000. Connected Disconnected |
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